Hemodynamic parameters within aortal stent-grafts vs. their spatial configuration : a comparison based on computer simulations

2008
journal article
article
dc.abstract.enBackground: It is difficult to find reliable premises which would enable a modification of the construction of stent-grafts to improve their durability and stability. Many systemic conditions make a comparison of homogeneous groups of operated patients a complicated task. Hence, it is helpful to use computer simulations and to verify them in a clinical observation. The hemodynamic parameters within aortal stent-grafts depending on their spatial configuration were compared using a computer simulation. Material/Methods: Computer simulations were made for 6 patients with abdominal aortal aneurysm (AAA) in whom bifurcated aortal stent-grafts were implanted. A basis for a spatial model were angio-CT data. Flow rate parameters were obtained in US-CD. In numerical calculations, CFD - Fluent® 6.2 software was used. Numerical grids (about 300,000 tetrahedral elements) were generated on the basis of three-dimensional geometries of AAA segmented from CT scans. A laminar character of flow was assumed. Blood viscosity was described by Quemada's rheological model. In all patients, two variants of the graft geometry were generated assuming that common long-body and shortbody grafts were applied. The patients’ real anatomical conditions were taken for the simulations. Pressure drop on the graft level and wall shear stress were analyzed. Results: It was found that the short-body graft caused a higher pressure drop along the inlet-outlet segment. The long-body graft offered smaller resistance to blood flow, and, consequently, the shear stress was lower. For the rate around 0.8 m/s, the difference reached 5500 Pa. In both variants, the highest value of shear stresses occurred near the bifurcation area. Conclusions: An increase of the shear stress is more distinct when the short- body graft is used, which can suggest that this part of the graft should be as long as possible.pl
dc.contributor.authorStefańczyk, Ludomirpl
dc.contributor.authorPodyma, Marekpl
dc.contributor.authorGrzelak, Piotrpl
dc.contributor.authorZbiciński, Ireneuszpl
dc.date.accession2019-04-26pl
dc.date.accessioned2019-04-26T10:52:51Z
dc.date.available2019-04-26T10:52:51Z
dc.date.issued2008pl
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.additionalBibliogr. s. 22pl
dc.description.number1pl
dc.description.physical22-26pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume73pl
dc.identifier.articleid677280pl
dc.identifier.eissn1899-0967pl
dc.identifier.issn1733-134Xpl
dc.identifier.projectROD UJ / OPpl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/73801
dc.identifier.weblinkhttp://archiwum.inforadiologia.pl/download/index/idArt/677280.htmlpl
dc.languageengpl
dc.language.containerengpl
dc.rightsUdzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Bez utworów zależnych 4.0 Międzynarodowa*
dc.rights.licenceCC-BY-NC-ND
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.pl*
dc.share.typeotwarte czasopismo
dc.subject.enabdominal aortal aneurysmpl
dc.subject.enendovascular therapypl
dc.subject.enstent-graftpl
dc.subject.enCFDpl
dc.subtypeArticlepl
dc.titleHemodynamic parameters within aortal stent-grafts vs. their spatial configuration : a comparison based on computer simulationspl
dc.title.journalPolish Journal of Radiologypl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
Background: It is difficult to find reliable premises which would enable a modification of the construction of stent-grafts to improve their durability and stability. Many systemic conditions make a comparison of homogeneous groups of operated patients a complicated task. Hence, it is helpful to use computer simulations and to verify them in a clinical observation. The hemodynamic parameters within aortal stent-grafts depending on their spatial configuration were compared using a computer simulation. Material/Methods: Computer simulations were made for 6 patients with abdominal aortal aneurysm (AAA) in whom bifurcated aortal stent-grafts were implanted. A basis for a spatial model were angio-CT data. Flow rate parameters were obtained in US-CD. In numerical calculations, CFD - Fluent® 6.2 software was used. Numerical grids (about 300,000 tetrahedral elements) were generated on the basis of three-dimensional geometries of AAA segmented from CT scans. A laminar character of flow was assumed. Blood viscosity was described by Quemada's rheological model. In all patients, two variants of the graft geometry were generated assuming that common long-body and shortbody grafts were applied. The patients’ real anatomical conditions were taken for the simulations. Pressure drop on the graft level and wall shear stress were analyzed. Results: It was found that the short-body graft caused a higher pressure drop along the inlet-outlet segment. The long-body graft offered smaller resistance to blood flow, and, consequently, the shear stress was lower. For the rate around 0.8 m/s, the difference reached 5500 Pa. In both variants, the highest value of shear stresses occurred near the bifurcation area. Conclusions: An increase of the shear stress is more distinct when the short- body graft is used, which can suggest that this part of the graft should be as long as possible.
dc.contributor.authorpl
Stefańczyk, Ludomir
dc.contributor.authorpl
Podyma, Marek
dc.contributor.authorpl
Grzelak, Piotr
dc.contributor.authorpl
Zbiciński, Ireneusz
dc.date.accessionpl
2019-04-26
dc.date.accessioned
2019-04-26T10:52:51Z
dc.date.available
2019-04-26T10:52:51Z
dc.date.issuedpl
2008
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.additionalpl
Bibliogr. s. 22
dc.description.numberpl
1
dc.description.physicalpl
22-26
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
73
dc.identifier.articleidpl
677280
dc.identifier.eissnpl
1899-0967
dc.identifier.issnpl
1733-134X
dc.identifier.projectpl
ROD UJ / OP
dc.identifier.uri
https://ruj.uj.edu.pl/xmlui/handle/item/73801
dc.identifier.weblinkpl
http://archiwum.inforadiologia.pl/download/index/idArt/677280.html
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Bez utworów zależnych 4.0 Międzynarodowa
dc.rights.licence
CC-BY-NC-ND
dc.rights.uri*
http://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.pl
dc.share.type
otwarte czasopismo
dc.subject.enpl
abdominal aortal aneurysm
dc.subject.enpl
endovascular therapy
dc.subject.enpl
stent-graft
dc.subject.enpl
CFD
dc.subtypepl
Article
dc.titlepl
Hemodynamic parameters within aortal stent-grafts vs. their spatial configuration : a comparison based on computer simulations
dc.title.journalpl
Polish Journal of Radiology
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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